Exposure category† | Petroleum coke/spent catalyst | Hydrocarbon lubricants | Hydrocarbon solvents/fuels |
---|---|---|---|
SIR (95% CI) | SIR (95% CI) | SIR (95% CI) | |
Observed | Observed | Observed | |
*Expected numbers based on cancer incidence rates for the general Canadian population. | |||
†Units for exposure tertiles varies by substance (see tables 6–8 for units). | |||
Unexposed | SIR = 0.58 | SIR = 0.63 | SIR = 0.72 |
(0.40 to 0.82) | (0.39 to 0.96) | (0.43 to 1.14) | |
Obs = 32 | Obs = 21 | Obs = 18 | |
Lowest exposure tertile | – | SIR = 0.71 | SIR = 0.54 |
(0.33 to 1.36) | (0.22 to 1.11) | ||
Obs = 3 | Obs = 9 | Obs = 7 | |
Middle exposure tertile | – | SIR = 0.50 | SIR = 0.52 |
(0.16 to 1.16) | (0.19 to 1.14) | ||
Obs = 2 | Obs = 5 | Obs = 6 | |
Highest exposure tertile | SIR = 2.17 | SIR = 1.13 | SIR = 0.89 |
(0.87 to 4.48) | (0.52 to 2.15) | (0.48 to 1.53) | |
Obs = 7 | Obs = 9 | Obs = 13 |